The Secret Society of Lathe Trolls

Thank you so much.
I am grateful for your help.
This was the last chunk of info needed to optimize my cuts. From here I learn the ropes through trial and error.

Is the reduction in ohm rating and +DB rating proportional, bringing the db input to approximately zero?

Thank you very much. A test record, I have many, is an excellent idea.
Where would you put the reverse RIAA filter in this setup?
Can you recommend a ball park +db level to match a 4 ohm head before I attempt to calibrate to your parameters?

Thanks Mark, I have a Presto 6N with the 1C cutterhead. It was originally rated at 500 ohms but I had it modified to 4 ohms so I could reference the speaker output of various amplifiers. The original manual requested an optimal 20 DB input to the head. Now that I have modified the head to 4 ohms, I ...

What DB input would be suggested with a four ohm cutterhead?
Thank you for any advice.

Thanks Tim, I tried to start the motor with the 2.5 mfd capacitor and got nothing. That is when I noticed the mfd should be 3.75. So, I am not sure if the problem is with the motor or 2.5 capacitor. I have ordered a 3.75 capacitor with a 370 vac rating and will try it as soon as it shows up. If the ...

MY Presto 6N has a Bodine model NYC-34. The rating plate indicates 50/60hz 1500/1800 RPM. 1.0 Amp 1/25 HP. It should have a 3.75 mfd capacitor but came with a 2.5 for the GE motor option. When I replace the capacitor with a 3.75 mfd, what should the VAC rating be? My first post. Thank you very much ...